It can also affect your opinions ability, a warning sign called fibro fog, along with your energy level, bringing you extreme fatigue. Fibromyalgia and chronic fatigue syndrome are viewed as separate but related disorders. They share a standard symptom -- severe fatigue that greatly decreases people's lives. Fatigue is probably the most prominent signs of fibromyalgia. Here's what the investigation actually says about precisely how to relieve fibromyalgia fatigue!